Graduated-release triple valve.



W. V. TURNER. GRADUATED RELEASE TRIPLE VALVE.

APPLIUATIOII FILED FEB. 7, 1906.

971,421, v I Patented Sept27,1910.

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may be secured.

' its operating piston for securing graduating 'voir or source of fluid pressure other than UNITED STATES PATENT OFFICE.

WALTER v. TURNER, or WILKINsBURG, PENNSYLVANIA, AssIGNoR To THE WEST- INGHOUSE AIR BRAKE COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

To all whom it may concern:

Be it known that I, WALTER V. TURNER, a citizen of the United States, residing in Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a certain new and useful Improvement in Graduated 'Release Triple Valves, of whlch im rovement the following is a specification. his invention relates to -flu1d pressure brake apparatus, and has for its object to provide an improved valve device operating in response to variations in fluid pressure, and connection with an additional reser the usual auxiliary reservoir, for controllin the release from the brake cylinder, an communication from the additional source of pressure to the auxiliary reservoir, whereby a graduated release of the brakesand a quick recharge of the auxiliary. reservoir Heretofore it has been proposed to com bine a supplemental reservoir with an automatic brake apparatus and a valve device having a single valve moved positively by effects both in the application and release of the brakes. Such a construction has been found to be defective, however, for the reason that no means are provided for arresting the movement of the valve at certain intermediate positions, except the resulting varia-' tions of pressure onthe opposite sides of the operating piston due to the opening orclosing of certain ports, and the valve is liable to move too far and thus destroy the delicacy of the graduating'elfect. My invention therefore comprises means, preferably in the form of a yielding stop (16 vice, for defining an intermediate or la I p0 sition of the valve device in which the rake cylinder port, and the port communicatingwith the additional source of pressure are closed, thereby preventing an excessive travel of the valve beyond this position in graduating the brake cylinder pressure on 01* OH. This yielding stop device is preferably made in the form of'an extended springactuated graduating stem of the triple valve device and it is'in connection with'this form of improvement that I have illustrated the invention in the accompanying drawing, inwhich Figure 1 is a sectional view of a'triple' Specification of Letters Patent. Patented Sept. 27, 1910. Application filed February 7, 1905. Serial No. 244,622.

valve device embodying my improvement; Fi 2a similar sectional view showing the va ve in its intermediate or lap position; Fig. 3 a similar sectional view showing a modified form of triple valve device having asinglejslide valve; and Fig. 4 a small diagram illustrating the equipment as applied on a car.

Referring to Fig. 4, the reference numeral 1 representsthe usual train pipe, 2 the auxiliary reservoir, 3 the brake cylinder, and 4: the triple valve device. According to this invention an additional source of air pressure is used to supply air to the auxiliary reservoir on the auxiliary reservoir side of the triple valve piston, when the brakes are sired.

As shown in Figs. 1 and 2, I have applied device having the usual piston chamber 7, valve chamber 10, piston 8, stem 11, slide valve 12 and graduating valve 9, the valve seat having exhaust port 18 and brake cylinder port 16 leading to passage 14, while the valve is provided with service port 15, emergency port 13 and exhaust cavity 17, all of 'Which may be of the ordinary well known construction. An additional port 19 in the valve seatcommunicates with pipe 6 and the additional reservoir 5.

According to my improvement a yielding resistance means is provided for defining an intermediate or lap position of the valve, in which the additional reservoir port 19 and the service port are closed, and as here shown this comprises the long graduating stem 20 having spring 21, and adapted to engage the piston in such; position that these ports are closed as shown'in Fi 2.

When the triple valve is in release position, as indicated in Fig; 1, and air under pressure is supplied to =the, train pipe, it flows through the usual feed groove around the piston 8 and charges the valve chamber pipe 6 to the normal standard degree of pressure. en a train pipejreduction is made for a service application of the brakes the piston 1 main slide ivalve ashort distance suificient,

to carry the servlce port and the brake cylinder -port 16 -out of register, and this is necessary in thegmodified form of valve shown in Fig. 3, in which there is no-grad- 20 uating valve and the'service port opens di-- rectly into; thev alve chamber and auxiliary reservoiL liLeither case, it will be noted that the supplemental reservoir port 19 is closed at thIQfiI St QHtWaI'd movement of the slide valve so,that' the higher degree of 'pressu is retained, in this reservoir. i v fibfizdeei fedatoreduce the brake cylinder pressure certain amount, a correspondingdncreaseis made in .the train pipe pressure qand theibrake valve then lapped,

whereuppn the, triple valve moves up to release position, opening the port 19 and the brake cylinder exhaust port. The brake cylindel' -pressurel tlien begins to reduce by ex- 35 hanstingtogtlreatmosphere,but as air from.

the 'higher;' pressureof the supplemental reservoir E or. other source of; supply then flows. intp'fthe-valve chamber and raises the pressuregon;the;auxiliary reservoir side of the triple alive-piston the same is moved out l again; ,to;- .-its. I intermediate position, in whichittouches the yieldingstop and'closes the-brakecylinder exhaust andthe admissiongjaorl pfrom the additional reservoir or other'source ofsupplv. Further reductions in thegbralre cylinder pressure may be made jma similanmanner,'and it will be noticed tl atiii 'each-icase the auxiliary reservoir is rechargedgfrom the-additional source to a corresppnding e'xtentl I 'Igf aafullwrelease ofthe brakes is desired a '3t-3 JI- 1y;--l ll1;1e ,--tCOI'llllIlLIOllS increase is made in tra n pipe pressure which holds the triple valve in 'full release position a sufiicient length, of time to allow a complete exhaust fromthebra lrecylinder. It is therefore, evidentthat perfect-control of the brakes is tlrusg secured and that the brake cylinder In gradnatin'g o'fl the brake cylinder pres Y Y 2 with g duating valve moves out and drawsthe slio valve to service posit on,

pressureanayjbe gradedup or down at will.-

movement as to again open the service port to the brake cylinder, and this is the great advantage derived from the use of aresi'st ance device, such as the yielding graduating spring or stop which engages the p1ston' or valve at the intermediate or lap position and defines this position in which the brake cylinder port and the additional supp ,ort are closed. This yielding stem also e nes the lap position of the valve in a graduated application of the brakes when the auxiliary reservoir pressure falls to that of the train' pipe as previously explained. 1

An emergency application may be made in the usual manner by a sudden and greater reduction in train pipe pressure which causes- .1 the piston and valve to travel out: to the ex:- treme p0sition,.compressing the graduatingspring to a greater extent and bringing the" emergency port 13 into register witli'rthe brake cylinder port 15. It will beunder-m "w stood that the additional supply port 19 isat. one side of the valve so as not to register, with the exhaust cavity 17. Y

By the use of my improvement for-defin ing the intermediate or lap position of the: r valve in graduating down thebrake cylinder pressure, all excessive outward movement of the valve and consequent undesirable opemv ing of the brake cylinder service port-isei fectually prevented and a -much moredefinite and positive action of thevalve is secured. 1

Having now described my invention, what I claim as new and desire to secure by Let ters Patent is:- I A 1. In a fluid pressure brake, thecombina v tion with a train pipe, auxiliary reservoir, and brake cylinder, of an additional reservoir or source of pressure, and a valve de 1105 vice having yielding resistancemeans fon defining an intermediate orilap position,and' a operated-by Variations in fluid pressure for controlling the release from the-brake cylinder and. communication from the addi' tional source to the auxiliary reservoir.

2; In a fluid pressure brake, the combination with a train pipe, auxiliary reservoir, brakecylinder, and an additional reservoir or supply, of a valve device havinga mov-' able abutment operated byvariations -'in fluid pressure, a valve actuatedby said 'abutment for controlling communication from" the additional reservoir to the'auxiliary res-" ervoir, and yielding resistance means for defining an intermediate or lap position of said valve. I i

3. In a fluid pressure brake, the combina tion with a train pipe, auxiliary reservoir, brake cylinder, and an additional IQSGr-f voir or supply, of a valve device havin 'a" movable abutment subject to the opp0s1ng" pressures of the train pipe and auxiliary" reservoir, a valve operated by said abutment for controlling communication from the means for defining side of said abutment and the release from.

the brake cylinder, and yielding resistance an. intermediate or lap position of said valve.

4. A triple valve device having a brake cylinder'port and a port for supplying air from an additional reservoir or source to the auxiliary reservoir, and a yielding resistance means for defining an intermediate or lap position of the valve in which these ports are closed.

5. A triple valve device having ports adapted in one position to open the exhaust from the brake cylinder and communication from an additional reservoir or source to the auxiliary reservoir, and in another position to open communlcation from the auxillary reservoir to the brake cyllnder, and a ylelding stop for defining an intermediate lap position With the ports closed.

f 6. In a fluid pressure brake, the combination with a train pipe, auxiliary reservoir, brake cylinder, and additional reservoir or source, a triple valve device having ports for opening the brake cylinder exhaust, and

communication from the additional reservoir to the auxiliary reservoir in release p0- s'ition, and for opening communication from the auxiliary reservoir to the brake cylinder in service position, and a graduating spring for defining an intermediate lap position.

In testimony whereof I have hereunto set my hand.

WALTER V. TURNER. Witnesses:

R. F. EMERY,

J. B. MACDONALD. 

